Who's the best singer out of the Henson Muppeteers?

We all know that most, if not, all of the Henson performers are fantastic singers, but who do you think has the best singing voice out of all the muppeteers? You can rank them in order from best to worst or if you don't think any of the performers are bad singers, just pick your favorites.
Here's my list:
Jerry Nelson
Richard Hunt
Steve Whitmire
Kevin Clash
Dave Goelz
Fran Brill
Jim Henson
Frank Oz
Marilyn Sokol (even though she wasn't a muppeteer)
Kathy Mullen
Karen Prell
David Rudman
Noel MacNeal

Louise Gold (fantastic singer, she just HAS to come top of my list)
Jerry Nelson (One of the very few people to have parterned Louise in duets and actually been a great vocal match for her)
Richard Hunt

However a few others can be jolly good:
Steve Whitmire
Kathy Mullen
Jim Henson (at least when singing as Kermit)
Dave Goelz (not one of the greatest vocally, however as Gonzo in particular he can be quite a moving singer emotionally)

I would actually go as far as to say it was my admiration for Louise Gold's amazing singing, particularly her lovely big vibrato belt (particularly well illustrated on such Sesame Street numbers as 'I Get A Kick Out Of U' and 'Anyone's Nose', as well as on TMS's 'Bluefish Blues', that in a way grabbed my attention and made me be a Muppet fan.
She's my favourite Muppeteer anyway, but that is mainly because of her wonderful singing voice. She is also my favourite Musical Theatre performer.
(If you want to know about her diverse career check out: http://www.qsulis.demon.co.uk/Website_Louise_Gold/Start.htm ).